Sidewall for a cup



FIG. 1 is a perspective view of a sidewall for a cup;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top view thereof; and,

FIG. 5 is a bottom thereof.

The broken lines in the drawings depict environmental subject matter only and form no part of the claimed design. 

CLAIM The ornamental design for a sidewall for a cup, as shown and described. 